Collaborative Research: III-V Nanopillars Grown on Si Substrates

该计划的目标是探索在硅衬底上形成的III-V图案纳米微管的生长、结构、光学和电子输运特性，以实现潜在的新型电子和光电子应用。柱子的形成涉及一种混合方法，该方法使用分子束或金属有机气相外延技术将光刻图案化的衬底和催化层相结合。尽管与硅衬底有13%的晶格失配，但催化剂的引入使高度结晶柱的形成成为可能。这是一种将直接带隙、高迁移率的III-V纳米结构集成到CMOS平台上的很有前途的方法。该方案的智能优点是通过控制催化种子在衬底上的扩散过程，在掩膜硅衬底上实现III-V纳米管柱的图案化选择性生长。最后，将在同一硅衬底上制造基于III-V垂直柱基的LED和光电探测器，作为这种片上光学互连的异质集成的变革性概念的展示。这项活动的更广泛影响结合了两所大学在纳米材料生长、表征、图案化、器件制造和建模等互补领域的专业知识和基础设施。下一代科学家和工程师的接触和培训是通过研究生和本科生的大量参与进行的，目标是让代表不足的群体参与。加州大学洛杉矶分校和亚利桑那州立大学每年都计划让高中生参加暑期项目。

AbstractThe program objective is to explore the growth, structure, optical and electronic transport properties of III-V patterned nanopillars formed on silicon substrate for potential novel electronic and optoelectronic applications. The pillar formation involves a hybrid approach which combines a lithographically patterned substrate and a catalyst layer using either molecular beam or metal organic vapour phase epitaxial techniques. The introduction of the catalyst enables highly crystalline pillar formation despite the 13% lattice-mismatch to the silicon substrate. This is a promising approach to integration of direct bandgap, high mobility III-V nanostructures into the CMOS platform.The Intellectual merit of this proposal is the novel approach that will enable patterned selective growth of III-V nanopillars within a masked Si substrate, by manipulating the diffusion process of catalytic seeds on the substrates. In the end, a III-V vertical pillar based LED and photodetector on the same Si substrate will be fabricated, as a demonstration of the transformative concept of this heterogeneous integration of on-chip optical interconnect. The scientific outcomes will have applications in future high speed, low power electronic devices and on-chip opto-electronics.The Broader impacts of this activity combines expertise and infrastructure from two universities in complementary areas of nanomaterials growth, characterization, patterning, device fabrication and modeling. The exposure and training of the next generation of scientists and engineers occurs through substantial involvement of graduate, undergraduate students, targeted toward the participation of underrepresented groups. Specific involvement of high school students during summer programs is planned for each year at UCLA and ASU.